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INFLUENCE OF OREGON COASTAL STREAM TEMPERATURES ON THE OCCURRENCE OF BLACK SPOT INFESTATION IN JUVENILE COHO SALMON
Citation:
Cairns, M A., J L. Ebersole, J P. Baker, S. M. Davis, H. Lavigne, AND P. J. WIGINGTON JR. INFLUENCE OF OREGON COASTAL STREAM TEMPERATURES ON THE OCCURRENCE OF BLACK SPOT INFESTATION IN JUVENILE COHO SALMON. Presented at Oregon Chapter American Fisheries Society, Sunriver, OR, February 18-20, 2004.
Description:
We quantified the occurrence of black-spot infestation of juvenile salmonids in the West Fork Smith River stream network during the summer 2002 through summer 2003 period. In this Oregon Coast Range watershed, highest summer seven-day average daily maximum (ADM) temperatures were found to correlate with infestation. We summarized frequency and varying infestation severity of coho juveniles by location within the network and summarized temperatures for 20 intensive study reaches. We also plotted infestation rate against fish length, weight, and condition factor and proposed some causative agents of black spot infestation. Summer ADMs ranged from approximately 23 C near the watershed mouth to approximately 18 C in the upper reaches of the mainstem and from approximately 15 C to 18?C in the lower tributary reaches. Upper tributary reaches had ADMs from 12-16?C. High summer temperatures were related to both elevation and percent riparian shade and were consistently higher in summer 2003 than in summer 2002.